JP6888738B2 - Heating system - Google Patents

Description

The present invention relates to a heating system.

For example, a heating system is known that uses a high-temperature fluid generated by a heat pump or other heat source device to perform a heating operation and a heat storage operation for storing heat in a tank.

Patent Document 1 discloses a hot water heating hot water supply device capable of performing a heating operation and a heat storage operation by using a heat source, a storage tank, seven switching valves, and one pump.

Japanese Patent Application Laid-Open No. 2008-232462

In the configuration of Patent Document 1, since a large number of actuators are required, the control of the switching valve becomes complicated, the power consumption becomes high, the product cost becomes high, and the product weight becomes heavy.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a heating system which is advantageous for simplifying the equipment configuration.

The heating system of the present invention has a tank for storing a fluid, an inlet and an outlet, a heat source for heating the fluid, a suction port and a discharge port, a pump for circulating the fluid, and a discharge port for the pump. A first passage having a first passage connecting the inlet of the heat source, a second passage connecting the fluid outlet of the heating equipment and the suction port of the pump, and a first port having a first port, a second port, and a third port. A third passage connecting the switching valve, the second switching valve having the fourth port, the fifth port, and the sixth port, the first branch formed in the middle of the first passage, and the first port. And the fourth passage connecting the second branch formed in the middle of the second passage and the second port, the fifth passage connecting the lower part of the tank and the third port, and the heat source. The sixth passage that connects the outlet and the fourth port, the seventh passage that connects the upper part of the tank and the fifth port, the sixth passage that connects the sixth port, and the fluid inlet of the heating equipment. Eight passages and a control means for controlling the operation of the heat source, the pump, the first switching valve, and the second switching valve are provided, and the first switching valve is in a state where the third passage communicates with the fifth passage. -It is possible to switch between the 5th communication and the 4th-5th communication in which the 4th passage communicates with the 5th passage, and the 2nd switching valve is in the state where the 6th passage communicates with the 7th passage. A certain 6th-7th communication, a 6th-8th communication in which the 6th passage communicates with the 8th passage, and a state in which the 7th passage communicates with the 8th passage and the 6th passage is blocked. A heating system that can switch between a certain 7th-8th communication and a 6th-7th-8th communication in which both the 6th and 7th passages communicate with the 8th passage, and is controlled. The means can execute the heat source heating operation, the tank heating operation, and the mixed heating operation. During the heat source heating operation, the fluid that has passed through the heat source is connected by connecting the second switching valve to the sixth to eighth communication. Is supplied to the heating equipment, and during the tank heating operation, the fluid flowing out from the upper part of the tank is made by setting the first switching valve to the third to fifth communication and the second switching valve to the seventh to eighth communication. There flow of fluid supplied Rutotomoni heat source is stopped to the heating device, when the mixing heating operation, the first switching valve third - the second switching valve while the fifth communicating sixth - seventh - eighth By communicating, a mixed fluid of the fluid that has passed through the heat source and the fluid that has flowed out from the top of the tank is supplied to the heating equipment, and the temperature of the fluid stored in the tank is the temperature of the fluid supplied to the heating equipment. If it is higher than the target value, the control means prohibits the tank heating operation and heat source. It performs a heating operation or a mixed heating operation.

According to the present invention, it is possible to provide a heating system which is advantageous for simplifying the equipment configuration.

It is a figure which shows the heating system by Embodiment 1. FIG. It is a figure which shows the flow of the fluid at the time of the heat source heating operation of the heating system shown in FIG. It is a figure which shows the flow of the fluid at the time of the tank heating operation of the heating system shown in FIG. It is a figure which shows the flow of the fluid at the time of the mixed heating operation of the heating system shown in FIG. It is a figure which shows the flow of the fluid at the time of the heat storage operation of the heating system shown in FIG.

Hereinafter, embodiments will be described with reference to the drawings. Common or corresponding elements in the drawings are designated by the same reference numerals to simplify or omit duplicate description.

Embodiment 1.
FIG. 1 is a diagram showing a heating system according to the first embodiment. As shown in FIG. 1, the heating system 1 includes a tank 101, a heat source 200, a pump 122, a first switching valve 124, a second switching valve 125, and a control device 150. The tank 101 corresponds to a heat storage tank that stores a fluid as a heat medium. The fluid may be water, or may be a liquid other than water, such as an aqueous solution of calcium chloride, an aqueous solution of ethylene glycol, or alcohol. In the tank 101, a temperature stratification is formed in which the upper side is high temperature and the lower side is low temperature due to the difference in fluid density due to the difference in temperature. The tank 101 is covered with a heat insulating material (not shown).

The tank 101 is not limited to a single tank as shown in the figure, and may include a plurality of tanks connected in series. In the following description, the height direction, that is, the vertical direction position in the tank 101 will be referred to, but when the tank 101 includes a plurality of tanks connected in series via a pipe, the tank 101 starts from the highest tank. The vertical position shall be specified in the entire hierarchy up to the lowest tank.

The heat source 200 can heat the fluid. The heat source 200 has an inlet 201 and an outlet 202. The fluid entering from the inlet 201 is heated inside the heat source 200. The heated fluid flows out of the outlet 202. The heat source 200 may include, for example, at least one of a heat pump, a boiler, and an electric heater.

The pump 122 circulates the fluid. The pump 122 has a suction port and a discharge port. The first passage 121 connects the discharge port of the pump 122 and the inlet 201 of the heat source 200.

The heating device 300 includes a fluid inlet 301 and a fluid outlet 302. The heating device 300 warms the room by dissipating the heat of the fluid. The heating device 300 may include, for example, at least one of a floor heating panel installed under the floor, a radiator installed on an indoor wall surface, a panel heater, and a fan convector. A plurality of heating devices 300 may be connected. When a plurality of heating devices 300 are connected, the connection method may be any combination of series, parallel, series and parallel.

The second passage 120 connects the fluid outlet 302 of the heating device 300 and the suction port of the pump 122. The first switching valve 124 has a first port 124a, a second port 124b, and a third port 124c. The second switching valve 125 has a fourth port 125a, a fifth port 125b, and a sixth port 125c.

A first branch portion 121a is formed in the middle of the first passage 121. The third passage 127 connects the first branch portion 121a and the first port 124a. A second branch portion 120a is formed in the middle of the second passage 120. The fourth passage 130 connects the second branch portion 120a and the second port 124b. The fifth passage 128 connects the lower part of the tank 101 and the third port 124c. The sixth passage 123 connects the outlet 202 of the heat source 200 and the fourth port 125a. The seventh passage 131 connects the upper part of the tank 101 with the fifth port 125b. The eighth passage 134 connects the sixth port 125c and the fluid inlet 301 of the heating device 300.

The control device 150 is electrically connected to each of the heat source 200, the pump 122, the first switching valve 124, and the second switching valve 125, and controls their operations. Further, sensors described later are electrically connected to the control device 150.

The first switching valve 124 can be switched between "third-fifth communication" and "fourth-fifth communication". The third-fifth communication is a state in which the third passage 127 communicates with the fifth passage 128 and the fourth passage 130 is blocked. The fourth to fifth communication is a state in which the fourth passage 130 communicates with the fifth passage 128 and the third passage 127 is blocked.

The second switching valve 125 can be switched between "sixth-7th communication", "sixth-8th communication", "seventh-8th communication" and "sixth-7th-8th communication". is there. The sixth-seventh communication is a state in which the sixth passage 123 communicates with the seventh passage 131 and the eighth passage 134 is blocked. The sixth-eighth communication is a state in which the sixth passage 123 communicates with the eighth passage 134 and the seventh passage 131 is blocked. The seventh-eighth communication is a state in which the seventh passage 131 communicates with the eighth passage 134 and the sixth passage 123 is blocked. The sixth-seventh-eighth communication is a state in which both the sixth passage 123 and the seventh passage 131 communicate with the eighth passage 134.

The heating system 1 of the present embodiment includes a remote controller 400. The control device 150 and the remote controller 400 are connected by wire or wireless so that data communication is possible in both directions. The remote control 400 may be installed in the room. The remote controller 400 has a function of receiving a user's operation regarding an operation operation command, a change of a set value, and the like. The remote controller 400 is an example of a user interface. Although not shown, the remote controller 400 may be equipped with a display for displaying information such as the state of the heating system 1, an operation unit such as a switch operated by the user, a speaker, a microphone, and the like. The heating system 1 may include a plurality of remote controllers 400 installed at different locations.

The heating system 1 of the present embodiment includes a flow rate sensor 126, a supply temperature sensor 132, and a post-heating temperature sensor 133. The flow rate sensor 126 detects the volumetric flow rate of the fluid passing through the pump 122. In the illustrated example, the flow rate sensor 126 is arranged in the first passage 121 between the first branch portion 121a and the pump 122, but as a modified example, the second branch portion 120a and the pump 122 have a second flow sensor 126. The flow rate sensor 126 may be arranged in the passage 120.

In the following description, the temperature of the fluid supplied to the heating device 300 is referred to as "supply temperature". The supply temperature sensor 132 arranged in the eighth passage 134 detects the supply temperature.

In the following description, the temperature of the fluid flowing out of the heat source 200 is referred to as "post-heating temperature". The post-heating temperature sensor 133 detects the post-heating temperature. In the illustrated example, the post-heating temperature sensor 133 is arranged at the outlet 202 of the heat source 200, but as a modification, the post-heating temperature sensor 133 may be arranged in the middle of the sixth passage 123.

The control device 150 can adjust the heating capacity of the heat source 200. The heating capacity of the heat source 200 is the amount of heat given to the fluid by the heat source 200 per hour. The unit of heating capacity of the heat source 200 is, for example, "watt".

The control device 150 can adjust the output and the rotation speed of the pump 122. The control device 150 can adjust the flow rate of the circulating fluid by adjusting the output or the rotation speed of the pump 122. The pump 122 may include a pulse width modulation control type DC motor whose rotation speed can be changed by a speed command voltage from the control device 150.

The heating system 1 of the present embodiment can carry out a heat source heating operation, a tank heating operation, and a mixed heating operation. FIG. 2 is a diagram showing a fluid flow during the heat source heating operation of the heating system 1 shown in FIG. In each of the drawings after FIG. 2, the control device 150 and the remote controller 400 are not shown.

As shown in FIG. 2, during the heat source heating operation, the control device 150 controls as follows. The first switching valve 124 is a third-fifth communication. The second switching valve 125 is connected to the sixth to eighth communication. The pump 122 and the heat source 200 are operated. The fluid heated in the heat source 200 is supplied to the heating device 300 through the sixth passage 123, the second switching valve 125, and the eighth passage 134. The fluid that has passed through the heating device 300 returns to the heat source 200 through the second passage 120, the pump 122, and the first passage 121.

During the heat source heating operation, the flow rate of the fluid flowing through the heat source 200 and the flow rate of the fluid flowing through the heating device 300 are equal to each other. Generally, when _{a heat pump type heat source 200 using a CO 2} refrigerant is used, the larger the difference between the temperature of the fluid entering the heat source 200 and the temperature of the fluid exiting the heat source 200, the higher the efficiency of operation. It has been known. Therefore, the more efficient the operation is, the lower the circulation flow rate of the fluid is. From this point of view, in the heat source heating operation, it is desirable that the control device 150 controls the circulation flow rate of the fluid to be a relatively low flow rate (for example, 3 L / min). During the heat source heating operation, it is desirable to receive a fluid having a relatively high temperature, and it is desirable to use a radiator or the like as the heating device 300, which is less affected by temperature unevenness.

During the heat source heating operation, the control device 150 may adjust at least one of the heating capacity of the heat source 200 and the output of the pump 122 so that the supply temperature detected by the supply temperature sensor 132 becomes equal to the target value. By doing so, the supply temperature can be easily and appropriately controlled. The target value of the supply temperature may be a value set by the user on the remote controller 400.

FIG. 3 is a diagram showing a fluid flow during the tank heating operation of the heating system 1 shown in FIG. As shown in FIG. 3, during the tank heating operation, the control device 150 controls as follows. The first switching valve 124 is a third-fifth communication. The second switching valve 125 is connected to the 7th-8th communication. Pump 122 is operated. The heat source 200 is stopped. The high-temperature fluid flowing out from the upper part of the tank 101 is supplied to the heating device 300 through the seventh passage 131, the second switching valve 125, and the eighth passage 134. The fluid that has passed through the heating device 300 passes through the second passage 120, the pump 122, the first passage 121 upstream of the first branch portion 121a, the third passage 127, the first switching valve 124, and the fifth passage 128. , Flows into the lower part of the tank 101.

During the tank heating operation, a fluid having a relatively high temperature (for example, 60 ° C. or higher) can be supplied to the heating device 300 at a relatively high flow rate (for example, 10 L / min or higher). When starting heating, it is desirable that the controller 150 perform a tank heating operation. Immediately after the start of heating, a high heating capacity is required, and by carrying out the tank heating operation, the demand can be surely met.

FIG. 4 is a diagram showing a fluid flow during the mixed heating operation of the heating system 1 shown in FIG. As shown in FIG. 4, during the mixed heating operation, the control device 150 controls as follows. The first switching valve 124 is a third-fifth communication. The second switching valve 125 is connected to the 6th-7th-8th communication. Pump 122 is operated. The heat source 200 may or may not be operated. The fluid that has passed through the heat source 200 flows into the second switching valve 125 through the sixth passage 123. The high-temperature fluid flowing out from the upper part of the tank 101 flows into the second switching valve 125 through the seventh passage 131. A mixed fluid in which the fluid that has passed through the heat source 200 and the fluid that has flowed out from the upper part of the tank 101 are mixed by the second switching valve 125 is supplied to the heating device 300 through the eighth passage 134. The fluid flowing out of the heating device 300 passes through the second passage 120 and the pump 122, and then branches into two flows at the first branch portion 121a. One flow returns to the heat source 200 as it is through the first passage 121. The other flow flows into the lower part of the tank 101 through the third passage 127, the first switching valve 124, and the fifth passage 128.

During the mixed heating operation, the control device 150 may adjust the mixing ratio by the second switching valve 125 so that the supply temperature detected by the supply temperature sensor 132 becomes equal to the target value. By doing so, the supply temperature can be easily and appropriately controlled.

In the mixed heating operation, the flow rate of the fluid flowing through the heat source 200 is lower than the flow rate of the fluid flowing through the heating device 300. Therefore, the flow rate of the fluid flowing through the heat source 200 (for example, 5 L / min) can be relatively low, while the flow rate of the fluid flowing through the heating device 300 (for example, 10 L / min) can be relatively high. According to such a mixed heating operation, even _{when a heat pump type heat source 200 using a CO 2} refrigerant is used, the operation can be performed with high efficiency and the heating device 300 can be operated at a high flow rate. Therefore, since the influence of temperature unevenness of the heating device 300 is unlikely to occur, it is suitable for use in floor heating or the like.

In the mixed heating operation, when the heating device 300 is required to have a relatively low heating capacity (for example, 1 kW), the control device 150 may perform the mixed heating operation without operating the heat source 200. By doing so, the heating operation can be performed with a relatively low heating capacity and a high flow rate.

In the mixed heating operation, when the heating device 300 is required to have a relatively high heating capacity, the control device 150 may carry out the mixed heating operation together with the operation of the heat source 200. Further, when the heating device 300 is required to have a high heating capacity (for example, 10 kW), such as immediately after the start of heating, the control device 150 has a high mixing ratio of the high temperature fluid flowing out from the tank 101 through the seventh passage 131. The mixing ratio by the second switching valve 125 may be adjusted so as to be.

Although not shown, the heating system 1 includes a temperature sensor that detects the temperature of the fluid stored in the tank 101. When the temperature of the fluid stored in the tank 101 is higher than the target value of the supply temperature, it is desirable that the control device 150 prohibits the tank heating operation and carries out the heat source heating operation or the mixed heating operation. By doing so, it is possible to more reliably prevent a fluid having a temperature higher than the target value of the supply temperature from flowing into the heating device 300.

In each heating operation of supplying fluid to the heating device 300, the control device 150 may adjust the output of the pump 122 so that the flow rate of the fluid detected by the flow rate sensor 126 is equal to the target value. By doing so, even if the pressure loss of the heating pipe changes due to long-term use, the same heating capacity can be continuously supplied.

Alternatively, the control device 150 may adjust the output of the pump 122 so that the rotation speed of the pump 122 becomes equal to the target value in each heating operation. By doing so, even when the heating device 300 is divided into a plurality of systems and the number of systems used changes, the heating capacity for each system can be kept constant. For example, the control device 150 controls so that the rotation speed of the pump 122 when the heating device 300 is used in one system is lower than the rotation speed of the pump 122 when the heating device 300 is used in two systems. You may.

The heating system 1 of the present embodiment can carry out a heat storage operation in which the fluid heated by the heat source 200 flows into the tank 101. FIG. 5 is a diagram showing a fluid flow during the heat storage operation of the heating system 1 shown in FIG. As shown in FIG. 5, during the heat storage operation, the control device 150 controls as follows. The first switching valve 124 is a fourth-fifth communication. The second switching valve 125 is a sixth-seventh communication. The low-temperature fluid flowing out from the lower part of the tank 101 flows into the fifth passage 128, the first switching valve 124, the fourth passage 130, the second passage 120 downstream of the second branch 120a, the pump 122, and the first passage 121. It is sent to the heat source 200 through the heat source 200. The hot fluid heated in the heat source 200 flows into the upper part of the tank 101 through the sixth passage 123, the second switching valve 125, and the seventh passage 131. By such a heat storage operation, a high-temperature fluid is gradually stored inside the tank 101 from top to bottom, and the amount of heat stored in the tank 101 increases.

In the heat storage operation, the control device 150 has at least the heating capacity of the heat source 200 and the output of the pump 122 so that the post-heating temperature detected by the post-heating temperature sensor 133 is equal to the target temperature of the fluid stored in the tank 101. Adjust one. Thereby, the temperature of the fluid stored in the tank 101 can be easily and appropriately controlled.

By operating the remote controller 400 by the user, the user may be able to select between the heat storage operation, the heat source heating operation, the tank heating operation, and the mixed heating operation. By doing so, good usability can be obtained.

As described above, the heat source heating operation is a heating operation that utilizes the heating capacity of the heat source 200, the tank heating operation is a heating operation that utilizes the heat storage of the tank 101, and the mixed heating operation is the heating capacity of the heat source 200 and the tank. It is a heating operation that can utilize both the heat storage of 101. According to this embodiment, the above-mentioned three types of heating operations can be carried out with a simple equipment configuration in which the number of switching valves and the number of pumps are small. Therefore, according to the present embodiment, it is advantageous in providing a heating system 1 having low power consumption, low cost, and light weight.

Each function of the control device 150 may be realized by a processing circuit. The processing circuit of the control device 150 may include at least one processor 151 and at least one memory 152. When the processing circuit includes at least one processor 151 and at least one memory 152, each function of the control device 150 may be realized by software, firmware, or a combination of software and firmware. At least one of the software and firmware may be written as a program. At least one of the software and firmware may be stored in at least one memory 152. At least one processor 151 may realize each function of the control device 150 by reading and executing a program stored in at least one memory 152. The at least one memory 152 may include a non-volatile or volatile semiconductor memory, a magnetic disk, or the like.

The configuration is not limited to a configuration in which the operation of the heating system 1 is controlled by a single control device, and a configuration in which the operation of the heating system 1 is controlled by coordinating a plurality of control devices may be used.

1 Heating system, 100 heat source, 101 tank, 120 second passage, 120a second branch, 121 first passage, 121a first branch, 122 pump, 123 sixth passage, 124 first switching valve, 124a first port , 124b 2nd port, 124c 3rd port, 125 2nd switching valve, 125a 4th port, 125b 5th port, 125c 6th port, 126 flow sensor, 127 3rd passage, 128 5th passage, 130 4th passage , 131 7th passage, 132 supply temperature sensor, 133 post-heating temperature sensor, 134 8th passage, 150 controller, 200 heat source, 201 inlet, 202 outlet, 300 heating equipment, 301 fluid inlet, 302 fluid outlet, 400 remote control

Claims (8)

A tank that stores fluid and
A heat source that has an inlet and an outlet and heats the fluid,
A pump that has a suction port and a discharge port and circulates the fluid,
A first passage connecting the discharge port of the pump and the inlet of the heat source.
A second passage connecting the fluid outlet of the heating device and the suction port of the pump,
A first switching valve having a first port, a second port, and a third port,
A second switching valve with a fourth port, a fifth port, and a sixth port,
A third passage connecting the first branch portion formed in the middle of the first passage and the first port,
A fourth passage connecting the second branch formed in the middle of the second passage and the second port, and
A fifth passage connecting the lower part of the tank and the third port,
A sixth passage connecting the outlet of the heat source and the fourth port,
A seventh passage connecting the upper part of the tank and the fifth port,
The eighth passage connecting the sixth port and the fluid inlet of the heating device,
The heat source, the pump, the first switching valve, and the control means for controlling the operation of the second switching valve are provided.
The first switching valve has a third-fifth communication in which the third passage communicates with the fifth passage and a fourth-fifth communication in which the fourth passage communicates with the fifth passage. It is possible to switch to communication and
The second switching valve has a sixth-seventh communication in which the sixth passage communicates with the seventh passage and a sixth-eighth communication in which the sixth passage communicates with the eighth passage. The communication, the 7th-8th communication in which the 7th passage communicates with the 8th passage and the 6th passage is blocked, and both the 6th passage and the 7th passage are the 8th passage. It is a heating system that can be switched to the 6th-7th-8th communication, which is a state of communication with the passage.
The control means can execute a heat source heating operation, a tank heating operation, and a mixed heating operation.
During the heat source heating operation, by connecting the second switching valve to the sixth to eighth communication, the fluid that has passed through the heat source is supplied to the heating device.
During the tank heating operation, the first switching valve is connected to the third to fifth communication and the second switching valve is connected to the seventh to eighth communication, so that the fluid flows out from the upper part of the tank. fluid flow of the fluid supplied Rutotomoni the heat source to the heating device is stopped,
During the mixed heating operation, the first switching valve is made to communicate with the third to fifth, and the second switching valve is made to communicate with the sixth to seventh to eighth, so that the heat source is passed through. A mixed fluid of the fluid and the fluid flowing out from the upper part of the tank is supplied to the heating device.
When the temperature of the fluid stored in the tank is higher than the target value of the temperature of the fluid supplied to the heating device, the control means prohibits the tank heating operation and heats the heat source. A heating system that performs an operation or said mixed heating operation. A supply temperature sensor for detecting a supply temperature, which is the temperature of the fluid supplied to the heating device, is provided.
During the heat source heating operation, the control means adjusts at least one of the heating capacity of the heat source and the output of the pump so that the supply temperature becomes equal to the target value.
The heating system according to claim 1, wherein during the mixed heating operation, the control means adjusts the mixing ratio by the second switching valve so that the supply temperature becomes equal to the target value. The heating system according to claim 1 or 2, wherein when the heating is started, the control means executes the tank heating operation. 1. A claim 1 comprising a user interface that allows a user to select between a heat storage operation in which the fluid heated by the heat source flows into the tank, a heat source heating operation, a tank heating operation, and a mixed heating operation. The heating system according to any one of claims 3. A flow rate sensor for detecting the flow rate of the fluid passing through the pump is provided.
The control means according to any one of claims 1 to 4, wherein when the fluid is supplied to the heating device, the control means adjusts the output of the pump so that the flow rate of the fluid becomes equal to the target value. Heating system. The control means adjusts the output of the pump so that the rotation speed of the pump becomes equal to the target value when the fluid is supplied to the heating device according to any one of claims 1 to 4. The heating system described. A post-heating temperature sensor for detecting the post-heating temperature, which is the temperature of the fluid flowing out of the heat source, is provided.
During the heat storage operation in which the fluid heated by the heat source flows into the tank, the first switching valve is set to the fourth to fifth communication and the second switching valve is set to the sixth to seventh communication.
In the heat storage operation, any one of claims 1 to 6 in which the control means adjusts at least one of the heating capacity of the heat source and the output of the pump so that the temperature after heating becomes equal to the target value. The heating system described in the section. At the time of the mixed heating operation, the control means executes the mixed heating operation in which the heat source is not operated and the mixed heating operation accompanied by the operation of the heat source, according to the heating capacity required for the heating device. The heating system according to any one of claims 1 to 7.

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